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I would caution anyone who under inflates his tires to be very careful. A under inflated tire will wear out on the edges faster. Have greater rolling resistance which uses more energy to roll. There is a reason they put 110 psi wheels on 5ers. I have 80psi on mine. I would also surmise that the lighter trailer like mine @ 13,000# max load is ok with the lower pressure tire but newer rig weigh more than mine would require more tire with higher psi wheels. Maybe they all come that way I don't know for sure. before I under inflate my tires I would talk to the tire guy to be sure it's ok to do that.
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